[GHC] #7894: Crash on :i M.->

[GHC]

#7894: Crash on :i M.->
---------------------------------+------------------------------------------
  Reporter:  monoidal            |          Owner:                  
      Type:  bug                 |         Status:  closed          
  Priority:  normal              |      Milestone:                  
 Component:  Compiler (Parser)   |        Version:  7.6.3           
Resolution:  fixed               |       Keywords:                  
        Os:  Unknown/Multiple    |   Architecture:  Unknown/Multiple
   Failure:  GHCi crash          |     Difficulty:  Unknown         
  Testcase:  ghci/scripts/T7894  |      Blockedby:                  
  Blocking:                      |        Related:                  
---------------------------------+------------------------------------------
Changes (by simonpj):

  * status:  new => closed
  * difficulty:  => Unknown
  * resolution:  => fixed
  * testcase:  => ghci/scripts/T7894


Comment:

 The panic in `OccName.isDataOcc` looked like this:
 {{{
 isDataOcc (OccName DataName _) = True
 isDataOcc (OccName VarName s)
   | isLexCon s = pprPanic "isDataOcc: check me" (ppr s)
                 -- Jan06: I don't think this should happen
 isDataOcc _                    = False
 }}}
 I see no good reason why `isDataOcc` should be sure that `isLexCon` would
 definitely be false (and it's true in this case).  So I've just removed
 the bogus looking test.

 Simon

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7894#comment:2>
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